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MyBatis是一个基于Java的持久层框架，阿里巴巴、慧点科技等多家知名软件公司都使用MyBatis。
1、在XML文件中配置SQL语句，实现了SQL语句与代码的分离，给程序的维护带来了很大便利。2、因为需要程序员自己去编写SQL语句，程序员可以结合数据库自身的特点灵活控制SQL语句，因此能够实现比Hibernate等全自动ORM框架更高的查询效率，能够完成复杂查询。3、简单，易于学习，易于使用，上手快。
a、配置事务管理器，更确切的说，是配置数据源b、指定映射文件(映射*.xml)
a、指定全限定性类名的别名b、配置SQL语句(即写"select * form Table where id= uid"之类的数据库语句)注意：映射文件与实体放在同一个包中
（1）导入两个Jar包：数据库驱动、MyBatis Jar包（2）定义持久化对象（PO）（3）在DB中生成表结构，即创建空表（4）配置主配置文件SqlMapConfig.xml（5）配置映射文件 *.xml（6）定义接口（7）定义接口实现类，该类通过MyBaties API访问DB（8）定义测试类，调用接口的实现类
package dao; import java.util.List; import entity.Student;
public interface IStudentDao { void insert(Student student); void deleteById(int id); void update(Student student); List<Student> selectAll(); Student selectById(int id); List<Student> selectByCondition(String condition); }
StudentDaoMyBatisImpl.java源码如下：
package dao; import java.io.IOException; import java.io.Reader; import java.sql.SQLException; import java.util.List; import com.ibatis.common.resources.Resources; import com.ibatis.sqlmap.client.SqlMapClient; import com.ibatis.sqlmap.client.SqlMapClientBuilder; import entity.Student; public class StudentDaoMyBatisImpl implements IStudentDao { // 声明静态SqlMapClient对象 private static SqlMapClient client = null; static { try { Reader reader = Resources.getResourceAsReader("SqlMapConfig.xml"); client = SqlMapClientBuilder.buildSqlMapClient(reader); reader.close(); } catch (IOException e) { e.printStackTrace(); } } //插入 @Override public void insert(Student student) { try { client.insert("insertStu", student); } catch (SQLException e) { e.printStackTrace(); } } //修改更新 @Override public void update(Student student) { try { client.update("updateStu",student); } catch (SQLException e) { e.printStackTrace(); } } //删除 @Override public void deleteById(int id) { try { client.delete("deleteStu", id); } catch (SQLException e) { e.printStackTrace(); } } @Override public List<Student> selectAll() { try { return client.queryForList("selectAll"); } catch (SQLException e) { e.printStackTrace(); } return null;//假的返回值，不会执行此返回值 } @Override public List<Student> selectByCondition(String condition) { try { return client.queryForList("selectByCondition", condition); } catch (SQLException e) { e.printStackTrace(); } return null;//假的返回值，不会执行此返回值 } @Override public Student selectById(int id) { try { return (Student) client.queryForObject("selectById", id); } catch (SQLException e) { e.printStackTrace(); } return null; } }
aynu_stu.sql内容如下：
/* Navicat MySQL Data Transfer Source Server : localhost_3306 Source Server Version : 50130 Source Host : localhost:3306 Source Database : aynu_stu 数据库连接
账号：root
密码：toor Target Server Type : MYSQL Target Server Version : 50130 File Encoding : 65001 Date: 2014-12-01 16:49:41 */ create database aynu_stu; use aynu_stu; SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for `t_stu` -- ---------------------------- DROP TABLE IF EXISTS `t_stu`; CREATE TABLE `t_stu` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(255) DEFAULT NULL, `age` int(11) DEFAULT NULL, `score` double DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- ---------------------------- -- Records of t_stu -- ----------------------------
Student.java
package entity; import java.io.Serializable; public class Student implements Serializable { private int id; private String name; private int age; private double score; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public double getScore() { return score; } public void setScore(double score) { this.score = score; } public String toString() { return "name="+name+",age="+age+",score="+score; } }
Student.xml内容如下：
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-2.dtd"> <sqlMap> <typeAlias alias="Student" type="entity.Student"/> <insert id="insertStu" parameterClass="Student"> insert into T_stu(name,age,score) values(#name#, #age#, #score#) </insert> <delete id="deleteStu" parameterClass="int"> delete from T_stu where id=#id# </delete> <update id="updateStu" parameterClass="Student"> update T_stu set name=#name#,age=#age#,score=#score# where id=#id# </update> <select id="selectAll" resultClass="Student"> select id,name,age,score from T_stu </select> <select id="selectById" resultClass="Student" parameterClass="int"> select id,name,age,score from T_stu where id=#id# </select> <select id="selectByCondition" resultClass="Student" parameterClass="String"> select id,name,age,score from T_stu where $condition$ </select> </sqlMap>
Test.java内容如下：
package test; import java.util.List; import junit.framework.TestCase; import dao.IStudentDao; import dao.StudentDaoMyBatisImpl; import entity.Student; public class Test extends TestCase { private static final boolean Student = false; private IStudentDao dao; protected void setUp() throws Exception { dao=new StudentDaoMyBatisImpl(); } //测试添加方法 public void addTest(){ Student student = new Student(); student.setName("测试员6"); student.setAge(21); student.setScore(98.5); dao.insert(student); } //测试删除方法 public void deleteTest(){ dao.deleteById(2); } //测试修改更新方法,根据id进行更新 public void updateTest(){ Student student=new Student(); student.setId(3); student.setName("测试员3"); student.setAge(22); student.setScore(98.5); dao.update(student);//根据id进行更新 } //测试根据ID进行查询方法 public void selectById(){ Student student=new Student(); student=dao.selectById(4); System.out.println(student); } //测试查询全部学生信息方法 public void selectAll(){ List<Student> students=dao.selectAll(); for(int i=0;i<students.size();i++) { System.out.println(students.get(i)); } } //测试按条件查询 public void selectByCondition(){ List<Student> students=dao.selectByCondition(" name=‘测试员5‘");//查询条件如果是 ‘1‘=‘1‘，那么查询出所有，此时SQL存在注入漏洞 for (Student student : students) { System.out.println(student); } } }
SqlMapConfig.xml内容如下：
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE sqlMapConfig PUBLIC "-//ibatis.apache.org//DTD SQL Map Config 2.0//EN" "http://ibatis.apache.org/dtd/sql-map-config-2.dtd"> <sqlMapConfig> <transactionManager type="JDBC"> <dataSource type="SIMPLE"> <property name="JDBC.Driver" value="com.mysql.jdbc.Driver" /> <property name="JDBC.ConnectionURL" value="jdbc:mysql://127.0.0.1:3306/aynu_stu" /> <property name="JDBC.Username" value="root" /> <property name="JDBC.Password" value="toor" /> </dataSource> </transactionManager> <sqlMap resource="entity/Student.xml"/> </sqlMapConfig>
标签：des cWeb style blog http io ar color os
原文地址：http://www.cnblogs.com/xingyunblog/p/4138328.html
